How do you start seeds when using an Amazon and normally use cuttings suspended by the neoprene collars in a net pot with no growing medium at all? I've seen the little spongy cubes used to germinate the seed in, but there's a risk of the sprinklers getting blocked with bits and the cubes get a bit waterlogged - an issue when the seedlings are young but not so much after they have developed some good root growth.